B.) View every interaction with an eBay users as a chance to convert them to buyers
For example courteous replies, proper grammar, an email signature, and thanking the buyer for their purchases may appear to be small things, but they are powerful ways to reinforced your position as professional, customer centric. A few small things will help build good will for future purchases.
C.) Set Clear Buyer Expectations
As it is often said, half of success is determined by the expectations you set. Similarly, in your interactions with eBay buyers, being up front with your customer service policies will help set expectations.
For example, if you only have one customer service representative or do not answer questions on weekends, noting that in your item description or in your Frequently Asked Questions pages will alert buyers as to when they should expect to hear a response.
